Lamp-guard clamp.



WITNESSES J. F, SHIELDS.

LAMP GUARD CLAMP. APPLICATION FILED DEC.12. 191a.

1,238,52u Patented Aug. 28,1917.

2 SHEETSSHEET I.

INVENTOR ATTORN EY J. F. SHIELDS. LAMP GUARD CLAMP.

Patented Aug. 28, 1917.

2 SHEETS-SHEET 2 TINT @TATE% AN IQW JOHN F. SHIELDS, OF GARFIELD, UTAH.

LAMP-GUARD CLAMP.

Application filed December 12, 1916.

To all whom it may concern:

Be it known that I, JOHN F. SHIELDS, a citizen of the United States, residing at Garfield, in the county of Salt Lake and State of Utah, have invented new and useful Improvements in Lamp-Guard Clamps, of which the following is a specification.

This invention relates to means for securing lamp guards, shades or the like in position upon incandescent lamps.

The primary object of the invention is to provide means whereby a guard or shade may be quickly and securely attached to a lamp socket.

Other objects and advantages of the invention will appear from the following description.

With the above in view the invention broadly consists of a divided tapered and threaded body member provided with offset interlocking lugs, the said lugs being engageable with the edges of the divided portions of the said member and a tapered threaded locking element for securing the body member upon the lamp socket.

In the drawings Figure 1 is an elevation of an incandescent lamp having a shade secured thereon by means of the improved clamp;

Fig. 2 is a longitudinal sectional view of the same;

Fig. 3 is a view of the blank from which the combined clamping member and shade is formed;

Fig. 1 is a detailed view illustrating the manner of applying the shade to the lamp, the clamping means in this figure consisting of separable clamping sections;

Fig. 5 is an elevation illustrating the man nor of attaching the guard by means of the clamp shown in Fig. 4;

Fig. 6 is a plan view of the clamp from which one half of the body member is formed;

Fig. 7 is a similar view of the blank from which the locking element is formed; and

Fig. 8 is a modified form of the lockmg element.

Referring to the drawings in detail and particularly to Figs. 1 to 3, the clamp is formed integral with the shade. As hereln shown the body member 1 of the clamp is formed by notchin the blank shown in Fig. 3 in the manner in icated at 2. This enables the shade 3 to be given the proper concavoconvex form and to provide for the tapering Specification of Letters Patent.

Patented Aug. 28, 191?.

Serial No. 136,577.

of the body member 1. This body member while formed integral with the shade, will for purposes of this description be designated as comprising sections a and 5, the said sections being formed with tapered outer edges 6 and arcuate top edges 7. The edges 6 are provided with offset lugs 8 and 9 which when the member is applied to the lamp will interlock in the manner shown in Fig. 1. The body member is further provided with threads 10 which are continuous when the sections 4: and 5 are adjusted in position.

For the purpose of clamping the member upon the lamp. socket there is provided a locking element 11, the said element being formed with threads 12, which are adapted to engage the threads of the body member. As will be seen from the drawings the body member 1 is tapered when in position and the locking element is of substantially the same taper. The tapered shape of the said body member and locking element permits the said element to be quickly adjusted and allows it to conform to the side of the body member should the said member be slightly larger or smaller than the one for which the locking element is intended. The seam 13 by means of which the locking element is formed into a continuous ring, provides a convenient grip which aids in turning the said element.

In Figs. 4c, 5 and 6 there is shown a modified form of the clamp which comprises the tapered body member 14: composed of separate sections 15 and 16, which are threaded after the manner of the member 1. This clamp is especially adapted for securing shades to the lamp and for this purpose is formed with an inwardly projecting body 17 by means of which the groove formed on the shade is engaged for the purpose of securing the shade in position. In other respects the clamp is similar to the one previously described and the blank from which each of the members 1 1 and 15 are formed is illustrated in Fig. 6. The clamp shown in Fig. 5 is identical with the one shown in Fig. 4 except for the method of securing the guard 18 thereto. In this form the body 17 is omitted and the wires from which the guard is formed have their ends secured in apertures provided in the clamp.

The construction of the locking element shown in Fig. 8 differs only in the form of the thread. In this figure there is a series of oblong depressions 19 arranged in the form of a thread, for engagement with the thread of the body member.

From the foregoing it is seen that the invention provides a simple and efiicient clamp by means of which lamp shades or curtains 'may be securely positioned and one in which the cost of manufacture is reduced to a minimum.

Having described the invention, what I claim, is;

1. A clamp. comprising a hollow frustoconical split body member provided with interlocking notches at its meeting edges and a hollow frusto-conical locking element for said member.

2. A clamp comprising a divided tapered threaded body member, ofi'set interlocking lugs formed on the meeting edges of the said member, said lugs being arranged to form copies of this patent may be obtained for notches, and a tapered threaded locking element formed of a sheet metal strip, the seam of thesaid locking element forming a gripping means for the said element.

3. A device of the class described compris ing a hollow frusto-conical body member, a shade formed integral therewith and a looking element cooperating with said body member for securing the same to a lamp socket. I

4:. A device of the class described comprising a hollow frusto-conical body member and a shade, formed from a single piece of material, said material being notched and provided with laterally extending arcuate portions to form a tapered lamp socket engaging member and a tapered locking element for the said body member.

In testimony whereof I affix my signature.

JOHN F. SHIELDS.

five cents each, by addressing the Commissioner of Iatents, Washington, .D. 0. 

